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Class drasys.or.linear.algebra.Algebra 

drasys.or.linear.algebra.Algebra
public class Algebra
implements AlgebraI
A class that implements the default linear algebraic operators.
Copyright (C) 1997 by DRA Systems all rights reserved.

Constructor Index

o Algebra()

Method Index

o add(MatrixI, MatrixI)
Add two matrices.
o add(VectorI, VectorI)
Add two vectors.
o invert(MatrixI)
Invert a matrix.
o multiply(MatrixI, MatrixI)
Multiply two matrices.
o multiply(MatrixI, VectorI)
Multiply a matrix by column vector.
o multiply(VectorI, MatrixI)
Multiply a row vector by matrix.
o multiply(VectorI, VectorI)
Multiply two vectors.
o subtract(MatrixI, MatrixI)
Subtract two matrices.
o subtract(VectorI, VectorI)
Subtract two vectors.
o transpose(MatrixI)
Transpose a matrix.

Constructors

o Algebra 
 public Algebra()

Methods

o add 
 public MatrixI add(MatrixI a,
                    MatrixI b) throws AlgebraException
Add two matrices.

Returns:
a SparseMatrix if both arguments are sparse and a DenseMatrix otherwise.
o subtract 
 public MatrixI subtract(MatrixI a,
                         MatrixI b) throws AlgebraException
Subtract two matrices.

Returns:
a SparseMatrix if both arguments are sparse and a DenseMatrix otherwise.
o multiply 
 public MatrixI multiply(MatrixI a,
                         MatrixI b) throws AlgebraException
Multiply two matrices. return a DenseMatrix.

o multiply 
 public VectorI multiply(VectorI a,
                         MatrixI b) throws AlgebraException
Multiply a row vector by matrix.

Returns:
a column vector.
o multiply 
 public VectorI multiply(MatrixI a,
                         VectorI b) throws AlgebraException
Multiply a matrix by column vector.

Returns:
a row vector.
o add 
 public VectorI add(VectorI a,
                    VectorI b) throws AlgebraException
Add two vectors.

Returns:
a SparseMatrix if both arguments are sparse and a DenseMatrix otherwise.
o subtract 
 public VectorI subtract(VectorI a,
                         VectorI b) throws AlgebraException
Subtract two vectors.

Returns:
a SparseMatrix if both arguments are sparse and a DenseMatrix otherwise.
o multiply 
 public double multiply(VectorI a,
                        VectorI b) throws AlgebraException
Multiply two vectors. return a scaler.

o transpose 
 public MatrixI transpose(MatrixI a)
Transpose a matrix.

Returns:
a SparseMatrix if the argument is sparse, a DenseMatrix otherwise.
o invert 
 public MatrixI invert(MatrixI a) throws AlgebraException
Invert a matrix.

Returns:
a DenseMatrix. 
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